D385 Einstellungen von Identität gehen verloren

Sorry, meiner Deutsch is nicht gut.
So the comment will be in English.

Could you provide which PBX you are using ?

We have same kind of behaviour with 3CX on D717 phones.
I believe this happens because of reregister, which from 3cx SNOM template happens every 120 sec./2 min.
This can be timed.

The default should be 3600 sec.
However, making a custom template with a different value than the default 120 sec. (in the template) does not work.
It still uses 120 sec. for some unknow reason.

Besides the time interval at which this occurs, I wonder if the identity just should be registrered untill an unsuccesfull registration.
However 20 sec. later, the same identity is registred again. (untill the next reregister)